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Difference among types: int, int32_t, __int32...

adairwu
adairwu asked
on
Medium Priority
2,121 Views
Last Modified: 2012-08-13

a quick question:

I saw different programs written by using different type notations for integer, like:

int
int32_t
__int32

is there any difference? or what's the guideline i should follow when writing codes?

thanks!
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Top Expert 2005
Commented:
int is the only built-in type you mention. It is the native integer size for the processor.  Since the sizeof(int) is not fixed in C (as it is in Java), many programmers define types for 8, 16, 32, and 64 bit integers that are not ambiguous.   Recently, most systems are defining them in system header files (like types.h) using common nomenclature.  int32_t is common in Unix and gcc environments.  __int32 is favored by Microsoft (leading underscores used because it is not officially part of the ANSI standard).

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